Conservation
sanaThe management of the earth resources to restore and maintain balance between human requirement and other species in the world is called conservation. Conservation includes continuous renewing of renewable resources.…
TYPE: Pinnularia – occurance ,reproduction & division
abidaOccurrence Pinnularia is a fresh water alga. It is found in pond. It is also present on the moist soil It is unicellular. Its cell is elongated and elliptical. Cell…
BIODIVERSITY
The variety of living organisms in an ecosystem is called biodiversity. The exact number of species in the world is not known. The taxonomists have described about 1.4 million species.…
ARIDITY
The word arid means dry. The dry land is called arid land. This problem is called aridity. Arid climate is defined as the climate in which precipitation is less than…
PHYLUM PLATYHELMINTHES
saadiaPHYLUM PLATYHELMINTHES Phylum Platyhelminthes contains over 20.000 animal species. They show following characters: They are flat- worms. They range in adult size from 1mm or less to 25 m. Parenchyma…
OBJECTIVE FOR ECOSYSTEM
Multiple Choice Questions (MCQs) The maximum percentage of energy changed into food is: (a) 10% (b) 20 (c) 30 (d) 5 Percentage of energy absorbed in atmosphere is: (a) 50 …
Triploblastic Acoelomate Body Plan
THE Triploblastic Acoelomate Body Plan EVOLUTIONARY PERSPECTIVE Members of the phyla Platyhelminthes, Nemertea and Gastrotricha show following advance characters: They are first bilaterally symmetrical animals. Therefore, they are more Complex…
SUBJECTIVE AND SHORT QUESTIONS FOR ECOSYSTEM
MODEL SUBJECTIVE QUESTIONS: What is ecosystem? Give its components. Give physiognomic characteristics. Write note on ecological energetics. Write note food chain, food web and trophic levels. Write note on ecological…
Division Bacillariophyta (DIATOMS)
Occurrence: Diatoms are aquatic. They are both marine and fresh water. They form brownish scum on the surface of mud and ponds. Diatoms are abundant during spring and autumn months.…
DEFINITIONS AND KEY POINTS FOR ECOSYSTEM
TERMS DEFINITIONS Ecosystem A community with its non-living environment is called ecosystem. Decomposers The microorganisms which decompose the bodies of dead animals and plants are called decomposes. Ecological energetic The…